设计一个简单的图书管理系统，包括以下类：
1、Book 类：表示一本图书，包括图书编号、书名、作者、出版日期等属性。
2、Library 类：表示图书馆，包括一个图书列表，可以添加图书、借出图书、归还图书等操作。
3、Person 类：表示图书馆的读者，包括姓名、借阅的图书列表等属性。
请用 C# 编写上述类，并提供简单的演示代码。
解答：
using System;
using System.Collections.Generic;class Book
{public int BookId { get; set; }public string Title { get; set; }public string Author { get; set; }public DateTime PublicationDate { get; set; }
}class Library
{private List<Book> books = new List<Book>();public void AddBook(Book book){books.Add(book);Console.WriteLine($"Book '{book.Title}' added to the library.");}public void BorrowBook(Book book, Person person){if (books.Contains(book)){books.Remove(book);person.BorrowedBooks.Add(book);Console.WriteLine($"{person.Name} borrowed the book '{book.Title}'.");}else{Console.WriteLine($"Sorry, the book '{book.Title}' is not available in the library.");}}public void ReturnBook(Book book, Person person){if (person.BorrowedBooks.Contains(book)){person.BorrowedBooks.Remove(book);books.Add(book);Console.WriteLine($"{person.Name} returned the book '{book.Title}'.");}else{Console.WriteLine($"{person.Name} did not borrow the book '{book.Title}'.");}}
}class Person
{public string Name { get; set; }public List<Book> BorrowedBooks { get; set; } = new List<Book>();
}class Program
{static void Main(){Book book1 = new Book { BookId = 1, Title = "Introduction to C#", Author = "John Smith", PublicationDate = new DateTime(2020, 1, 1) };Book book2 = new Book { BookId = 2, Title = "Data Structures and Algorithms", Author = "Alice Johnson", PublicationDate = new DateTime(2019, 5, 15) };Library library = new Library();library.AddBook(book1);library.AddBook(book2);Person person1 = new Person { Name = "Alice" };Person person2 = new Person { Name = "Bob" };library.BorrowBook(book1, person1);library.BorrowBook(book2, person2);library.ReturnBook(book1, person1);library.ReturnBook(book2, person2);}
}
)
